JPH10244844A - Fixing structure of vehicle exhaust pipe - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a simple fixing structure of a vehicle exhaust pipe which can control a movement of a clamp in the peripheral direction and in the axial direction. SOLUTION: In a fixing structure of a vehicle exhaust pipe, an annular clamp 33 having fastening members 33b, 33b is fitted on an exhaust pipe 10 joined to an exhaust port of an engine unit and a tip end 30b of a bracket 30 fixed to the engine unit is inserted between the exhaust pipe 10 and the clamp 33, the exhaust pipe 10 being fixed by fastening the fastening members 33b of the clamp 33. The clamp 33 has stoppers 35, 35 which are bent and contact the tip plane 30c of the bracket 30 to regulate a movement of the clamp 33 in the axial direction and the tip end 30b of the bracket 30 has a projection 36 which contacts an inner end planes 35a of the stoppers 35 to regulate a movement of the clamp 33 in the peripheral direction.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a vehicle exhaust pipe fixing structure for fixing an exhaust pipe to an engine unit or a vehicle body frame.

[0002]

2. Description of the Related Art In an automobile, for example, it is common to fix a front half of an exhaust pipe to an engine unit and suspend and support a rear half of the exhaust pipe on a floor panel. Conventionally, when fixing the first half of the exhaust pipe, an annular clamp is attached to the exhaust pipe connected to the exhaust port of the engine, and a bracket fixed to the engine unit is provided between the clamp and the exhaust pipe. In general, the distal end is inserted and the clamp is tightened with a bolt in this state (for example, see Japanese Utility Model Application Laid-Open No.
-88022).

[0003]

However, in the conventional structure, when the clamp is bolted, the clamp is rotated in the circumferential direction or moved in the axial direction, so that the fixed position of the clamp is shifted. There are cases. as a result,
There is a problem that the exhaust pipe is distorted by the circumferential fastening force, and in some cases, the exhaust pipe is cracked or the clamp is damaged.

In Japanese Utility Model Laid-Open Publication No. 1-96504, a positioning hole is formed in an annular portion of a clamp, and a projection is formed on a member to be clamped so as to engage with the positioning hole. A structure that restricts axial movement is disclosed. Although it is conceivable to adopt this positioning structure for the fixing structure, it is difficult to form a projection on the exhaust pipe.

SUMMARY OF THE INVENTION The present invention has been made in view of the above-described conventional circumstances, and has as its object to provide a vehicle exhaust pipe fixing structure capable of restricting circumferential and axial movement of a clamp with a simple structure.

[0006]

According to the present invention, an exhaust pipe connected to an engine is provided with an annular clamp having a fastening portion, and a distal end of a bracket fixed to an engine unit or a vehicle body frame is connected to the exhaust pipe. In a fixing structure for a vehicle exhaust pipe, which is inserted between a clamp and a fastening portion of the clamp to tighten the fastening portion of the clamp, the exhaust pipe is fixed to the clamp by abutting the clamp on the distal end surface of the bracket. A stopper for restricting the movement in the axial direction is formed, and a protrusion for restricting the circumferential movement of the clamp by contacting the clamp is formed at the tip of the bracket.

[0007]

Embodiments of the present invention will be described below with reference to the accompanying drawings. 1 to 7 are views for explaining a fixing structure of an exhaust pipe for a vehicle according to an embodiment of the present invention, and FIGS. 1 and 2 are cross-sectional rear views, perspective views showing a fixing structure of an exhaust pipe. FIG. 3 is a rear view of the clamp, FIGS. 4 and 5 are rear views and sectional views of the bracket, and FIGS. 6 and 7 are side views of the front half and the rear half of the exhaust pipe.

In the drawing, reference numeral 1 denotes an exhaust pipe for a vehicle,
The front part 3 is fixed to the engine unit 2 and the rear part 4 suspended from the lower surface of a floor panel (not shown).
It is composed of The engine unit 2 has a clutch 6 and a transmission 7 connected to a vertically mounted engine 5 having a crankshaft (not shown) directed toward the front of the vehicle body, and a transfer 8 for distributing engine power to the front wheels and the rear wheels. Are connected to each other.

The front half 3 has a structure in which a catalytic converter 11 is connected to a downstream end of a front exhaust pipe 10. An upstream end of the front exhaust pipe 10 is connected to a junction of an exhaust manifold connected to the engine 5. They are connected by a flange 12.
The latter half 4 is provided with a flexible pipe 14 in the middle of the rear exhaust pipe 13, a muffler 15 is connected to the downstream end of the rear exhaust pipe 13, and a tail pipe 16 is connected to the muffler 15.
Are connected. The upstream end of the rear exhaust pipe 13 is connected to the downstream end of the front exhaust pipe 10 via elliptical flanges 17. The catalytic converter 11 is provided with a sensor 18 for detecting an exhaust gas temperature.

Brackets 20, 21 are welded to the front and rear surfaces of the muffler 15 of the rear half 4, respectively. The brackets 20, 21 are attached to hangers 22, 23 fixed to the lower surface of the floor panel by rubber members 24. , 24 are suspended. The downstream end of the tail pipe 16 is also suspended and supported on the lower surface of the floor panel by the same structure as described above.

A bracket 30 is fixed to the transmission 7 with bolts. This bracket 30
Is a substantially L-shaped plate formed by bending a tongue-shaped fixing portion 30b on the lower edge of the plate-like supporting portion 30a. The support portion 30a is formed with fixing bolt holes 31, 31, and the fixing portion 30b is formed in an arc shape along the upper surface of the front exhaust pipe 10.

A clamp 33 is provided on the front exhaust pipe 10.
Is installed. This clamp 33 has a substantially
An annular holding portion 33a formed in a U-shape and a pair of fastening portions 33b, 33b extending outward from both end edges of the annular holding portion 33a.
A bolt 34 is inserted through the bolts b and 33b, and a nut 34a is screwed into the bolt 34.
The nut 34a is fixed to the fastening portion 33b. The annular holding portion 33a includes an abutting portion 33c that abuts on a lower half of the outer periphery of the front exhaust pipe 10 and bulging portions 33d, 33d having a gap with respect to the upper half of the outer circumference. The fixing portion 30b of the bracket 30 is inserted between the portions 33c, 33c and the outer peripheral surface of the front exhaust pipe 10.

Then, both bulging portions 33d of the clamp 33 are provided.
Are formed with bent portions 35, 35 extending in a hook shape from the rear end surface of the bulging portion 33d, and each of the stopper portions 35 is in contact with the front end surface 30c of the fixing portion 30b. The forward movement of the clamp 33 is restricted.

A projecting portion 36 is formed so as to protrude upward from the distal end edge of the fixing portion 30b, and the projecting portion 36 comes into contact with the inner end surface 35a of the stopper portion 35, thereby providing a clamp. 33 is restricted from moving in the circumferential direction.

Next, the operation and effect of this embodiment will be described. When assembling the front exhaust pipe 10 to the engine unit 2, the bracket 30 is fixed to the transmission 7, the clamp 33 is attached to the front exhaust pipe 10 in advance, and the clamp 33 and the front exhaust pipe are attached. The clamp 33 is moved forward so that the fixing portion 30b of the bracket 30 is inserted between the front exhaust pipe 10 and the front exhaust pipe 10, and the front exhaust pipe 10 is connected to the exhaust manifold in this state. .

Next, the clamp 33 is advanced to bring its stopper portions 35, 35 into contact with the distal end surface 30c of the fixing portion 30b. At this time, the projection 36 of the bracket 30 is located between the stoppers 35. As a result, the position of the clamp 33 in front is determined.

In this state, the bolt 34 of the clamp 33 is tightened by the impact wrench 40 as shown in FIG. In this case, the clamp 33 may rotate clockwise due to the force by which the worker presses the impact wrench 40. However, when the protrusion 36 hits the inner end surface 35a of the stopper 35, the clamp 33 moves in the circumferential direction. As a result, the circumferential position of the lamp 33 is determined. As a result, the front exhaust pipe 10 has its front part fixed to the engine 5 and its rear part to the transmission case 7.

As described above, according to the present embodiment, the stopper portion 35 which is in contact with the distal end surface 30c of the bracket 30 is formed by bending the clamp 33, and the inner end surface 35a of the stopper portion 35 is formed on the distal end edge of the bracket 30. Since the abutting projection 36 is formed, the movement of the clamp 33 in the circumferential direction and the forward direction can be restricted, and the positioning of the clamp 33 during the tightening operation can be reliably performed. As a result, it is possible to avoid a case where an excessive force acts on the front exhaust pipe 10 to cause a crack or a bracket or the like to be damaged.

Further, since the inner end surface 35a of the stopper portion 35 for restricting the movement of the clamp 33 in the front-rear direction is brought into contact with the projecting portion 36, the circumferential movement is restricted.
Accordingly, positioning in both the forward direction and the circumferential direction can be performed, so that a simple structure is required and the positioning operation can be easily performed. Further, since the stopper portion 35 and the projection portion 36 can be formed at the same time when the clamp 33 and the bracket 30 are press-formed, the cost is hardly increased by forming the stopper portion 35 and the like.

Further, since both the forward and circumferential directions of the clamp 33 are positioned, the operator can tighten the clamp 33 with one hand, and the working time can be reduced. Since the fixing work of the exhaust pipe is generally performed in a difficult posture on the underside of the vehicle body, the present embodiment is particularly effective in this regard.

In the above embodiment, the fastening portion 33b of the clamp 33 is provided at a position covering the fixing portion 30b of the bracket 30, but the position of the fastening portion 33b is arbitrary. Although two stopper portions 35 are provided, this stopper portion may be formed on only one of them. When the stopper portion 35 is provided on only one side, it is provided on the side to be fastened by the impact 40 (the front side in FIG. 2).

In the above embodiment, the case where the fixing structure of the present invention is employed as a structure for fixing the front exhaust pipe 10 to the engine unit 2 has been described. The present invention is also applicable to a case in which the panel is fixed to a bracket fixed to a panel.

[0023]

As described above, according to the exhaust pipe fixing structure for a vehicle according to the present invention, the stopper which comes into contact with the clamp attached to the exhaust pipe to the end face of the bracket to restrict the axial movement of the clamp is provided. Since a projection is formed at the end of the bracket to abut on the clamp to restrict the circumferential movement of the clamp, the clamp can be easily and reliably positioned at the time of tightening work. This has the effect of avoiding damage to the exhaust pipe, brackets, etc. due to the action of the strong force.

Further, since the clamp can be positioned both in the axial direction and in the circumferential direction, it is not necessary to hold the clamp in the exhaust pipe mounting operation, and the clamp can be tightened with one hand, thereby improving the workability.

[Brief description of the drawings]

FIG. 1 is a cross-sectional rear view illustrating a fixing structure of a vehicle exhaust pipe according to an embodiment of the present invention.

FIG. 2 is a perspective view of a clamp and a bracket portion of the fixing structure.

FIG. 3 is a rear view of the clamp.

FIG. 4 is a rear view of the bracket.

5 is a sectional view of the bracket (VV in FIG. 4).
Line cross section)

FIG. 6 is a side view showing a front half of the exhaust pipe.

FIG. 7 is a side view showing a rear half of the exhaust pipe.

[Description of Signs] 1 Exhaust pipe 2 Engine unit 10 Front exhaust pipe 30 Bracket 30b Fixed portion (tip portion) 30c Tip surface 33 Clamp 33b Fastening portion 35 Stopper portion 35a Inner end surface 36 Projection

Claims (1)

[Claims] An annular clamp having a fastening portion is attached to an exhaust pipe connected to an engine, and a distal end of a bracket fixed to an engine unit or a vehicle body frame is inserted between the exhaust pipe and the clamp, In a vehicle exhaust pipe fixing structure in which the exhaust pipe is fixed by tightening a fastening portion of the clamp, a stopper portion which abuts on a tip end surface of the bracket to the clamp to restrict axial movement of the clamp. And a projection for restricting circumferential movement of the clamp by contacting the clamp at the tip of the bracket.